Speed up your Active Record query performance by not loading Active Record objects when calling
present?. Inspired by this tweet thread.
Wait? Why not Commit to Rails? You have Commit right?
While this change is astoundingly small (in code terms) it might not be a good fit for 100% of apps (see the caveats section). This was already discussed then committed and eventually removed from the Rails codebase.
If this gem has legs and lots of people like it then it's a good proxy for a test run of changing the default rails behavior. If everyone hates it, then no harm, remove the gem from your Gemfile.
Add this line to your application's Gemfile:
And then execute:
Or install it yourself as:
$ gem install attendance
That's it. Now when you call
present? on an
ActiveRecord::Relation or an
ActiveRecord::Associations::CollectionProxy object, it will not load it into memory:
User.where(github: 'schneems').present? User Load (1.5ms) SELECT "users".* FROM "users" WHERE "users"."github" = $1 [["github", "schneems"]] => true
User.where(github: 'schneems').present? User Exists (1.2ms) SELECT 1 AS one FROM "users" WHERE "users"."github" = $1 LIMIT $2 [["github", "schneems"], ["LIMIT", 1]]
Note: The SQL query only returns back true/false (SELECT 1) instead of the whole object.
How does this Gem Work?
ActiveRecord::Associations::CollectionProxy to alias
After checking out the repo, run
bin/setup to install dependencies. Then, run
rake test to run the tests. You can also run
bin/console for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run
bundle exec rake install. To release a new version, update the version number in
version.rb, and then run
bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the
.gem file to rubygems.org.
Bug reports and pull requests are welcome on GitHub at https://github.com/schneems/attendance. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.
The gem is available as open source under the terms of the MIT License.
Code of Conduct
Everyone interacting in the Attendance project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.